[Gameplay] Is this a bug? Turret aggro prioritization and Gnar transform

My understanding of turret aggro priority for champions is (correct me if I'm wrong) that the closest champion to the enemy turret will be the one to take aggro from it first, unless there is a champion attacking an enemy champion under turret range obviously.

In the clip I posted, blitz goes ham on the tower dive and takes turret aggro and then runs out of range. Once blitz leaves turret range, rather than prioritizing the Gnar on my team who is directly under the turret, the turret focuses Jinx (me) who is farther away from the turret than Gnar.

Is this either

A) a bug, possibly because Gnar transformed under tower the moment it should have aggro'd onto him or B) correct that I should have been targeted, because tower priority works differently than I think it does and I'm dumb